Cop winding frame



uFuly 2 5, 1933. w 5 w 1,920,111

- COP WINDING FRAME Filed Dec. 4, 1950 5 Sheets-Sheet 1 July 25, 1933. wSCI-NEWER 1,920,111

COP WINDING FRAME Filed Dec. 4, 1930 5 Sheets-Sheet 2 July 25, 1933. wsc w 1,920,111

COP WINDING FRAME Filed Dec. 4, 1930 3 Sheets-Sheet 3 Patented July 1933UNITEDSTATES PATENT OFFICE WALTER SCHWEITER, OF HORGEN, NEAR ZURICH,SWITZERLAND cor WINDING FRAME Applicfltionfiled December 4, 1930, SerialNo. 500,126, and in Germanyianuary 21, 1930.

15 for instance on a thread guide which is adapted both to take up thevariations inthe tension of the thread and to exert a braking effectupon the unwinding bobbin by means of a band brake. This combination ofa thread'guide with a band brake has generally proved effective,although the fineness of the mutual adjustment and the effect of thebrake do not meet all possible events. Above all, the band brakeshitherto used are unable so to brake down the unwinding bobbin in anefficacious manner upon a sudden lowering of the tension of the thread,that disturbances are'excluded.

Now the invention has for its object to overcome these drawbacks, whichobject is achieved primarily the brake band employed being arranged soas to be swung about a fixed point, a spring accumulator beinginterposed which owing to its elasticity is adapted so to displace atleast the one point of suspension of the brake band in accordance withthe power actuating the brake, that the brake band embraces a greater orsmaller section of the periphery of the brake disc. While hitherto thebrake band whether attracted either by a great or by a small power,always touched the same section of the periphery of the brake disc,

according to the invention the surface on which the band and the disctouch one another, entirely depends upon the power employed, so that aslong as only a small power is exerted, the braking surface is alsosmall, While with increased braking power the braking surface increasesalso,

whereby the braking effect becomes more eflicacious and better adaptsitself to the prevailing conditions.

In order to regulate the possibility of adjusting the braking effect inaccordance with the thread material to be wound, the one fulcrum of thespring accumulator may be fixed to the one leg of a bell crank leverwhich is axially shiftable against the action of a spring, while theother leg, which has i the shape of a segment and is provided withnotches or holes adapted .to receive a fixed locking bolt, can be set indifferent positions, so that the fulcrum changes its position relativelyto the brake disc.

In order that the invention may be more readily understood, twoembodiments of the same are illustrated by way of example in theaccompanying drawings in which Figure 1 is a lateral view of a brakeforming the first embodiment,

Figure 2 is a View of the parts under consideration of a winding frame;

Figure 3 shows the upper portion, of the Figure 2 with some parts in adifferent position,

Figure 4 is a view similar to Figure 2 shows the other embodiment, and

Figures 5 and 6 show the appurtenant braking device in side and endview, respec tively, and on an enlarged scale.

Referring to these drawings, 4 denotes the unwinding bobbin on the shaftof which is rigidly mounted a brake disc 5. A prefei ably endless brakeband 6 embraces a portion of the periphery of disc 5 which band is fixedwith one end at 7 and with the other end at 8 to both ends of aresilient carrier 9 made from a steel strip; The carrier 9 constitutesthe spring accumulator mentioned above and forms a loop at 10 bywhich itis hingedly fixed to a journal 11 while the other end of carrier 9 restson a pull rod 12, Figure 1. As will be further seen from this figure,the two free ends of the brake band carrier 9 are bent off so as to havethe brake disc 5 between them. The pull rod 12 is under the influence ofthe thread guide 13, Figures 2 and 3, which guides the thread 14 on therollers 15 to the winding bobbin 16.

and

Figure 2 shows the thread guide 13 in the tensioned condition, which isthe case when the pull of the thread acting in the direction of arrowhas increased. This position of guide 13 causes, byineans of theconnection of rod 12, the brake band 6 to assume the position shownrelatively to the brake disc 5, in which position the brake band 6 is incontact with the latter only slightly or not at all.

to its elasticity, about to the position illustrated in Figure 3. Whenthis takes place,

rod 12 entrains the brake so that a displacement of'the fulcrum 7 and 8is caused rela ,tively to the brake disc 5, while the carrier 9 iselasticallybent down Vhile thus in the position of the parts shown in Figur c 2 the band 6, touched only a small section, of

again, the guide 13 lowers and the brake band 6 owing to the elasticityof carrier 9 assumes again its original position.

In order to enable an exact regulation of 7 the braking action thejournal 11 may be made adjustable. To this end as to be seen fromFigures 4 to 6, the journal 11 is fixed to the one leg 17 of a bell.crank lever 17, 19 which is fulcrumed at 18 amlthe other leg 19 of whichforms a segment 21 having a series of holsjQO. By means ot' an axiallyextending handle 22 lever 17, 19 can be shifted in an axial directionagainst, the actionof a spring 23. By these means the lever 17, 19 canbe locked in position by. a fixed bolt 21- engaging one of the holes 20,and released ,by retiring it on handle 22, whereupon it can be swung sothat journal 11 can beraised or lowerechas indicated by arrows, Figure5. In this way the position or the resilient carrier 9 and thus that ofthe brake band relatively to the brake disc is altered, whereby theoriginal braking action is increased or decreased, whilst the additionalalteration of the braking action by means .of-the pull of the thread 1 1is not influenced by this adjustment of journal 11. It may be noted thatthe embodiments illustrated are merelyexamples of realization of theessence of the invention, which is not confined to these specialdesigns. On

As soon as the pull of the thread 14" decreases, thethread guide 13rises owing -1. In the combination of a hand brake arrangement for anunwinding bobbin, a brake disc, a brake band in engagement with saidbrake, disc, a carrier-for said band having two arms across which saidband extends lever upon which said carrier is pivoted,

means for adjustably setting said lever with respect to saidhrake disc,and means for varying the angular contact surface between said brakedisc and band in accordance with the tension upon the thread unwoundfrom the bobbin. V

.2. I11 the combination of a band brake ar rangement for an unwindingbobbin, a brake disc, a brake band in engagement with said brake disc, acarrier for said band having, 'two arms across which said band extends,a

double armed lever mounted in the machine frame, upon which said carrieris pivoted, one of said arms of said lever carrying said pivoted joint01 thecarrier, and a plurality of locking apertures on the other armadapted to cooperateiwith a locking bolt to selec- .tively lock thedouble armed lever in different positions with respect to the brakedisc, andmeans for varying theangular con tact surface between saidbrake disc and band in accordance with the tension upon the threadunwound from the bobbin.

3. In the combination of a hand brake arrangement for an unwindingbobbin, a

brakeldisc, a brake band in engagement with said brake d1sc,'a carrierfor sald band hav-' ing two arms across which said band extends, adouble armed lever axially and angularly movable in the machine frameupon which said carrier is pivoted, one of said arms fol said levercarrying said pivoted jointoi the carrier, :Etlld a pluralityof lockingapertures on the other arm adapted to cooperate with a locking bolt toselectively lock the double armed lever in difierent p0 sitions withrespect to the brake disc, a spring for yieldingly maintaining saidlever in locked position, means for axially'shifting said lever torelease the same from its locked position, andmeans for varying theangular contact surface between said brake disc and band in accordancewith the tension upon the thread unwound from the bob bin. 1 j

I WALTER SCHWEITER.

